THE genus Squamulina, according to Dr. Carpenter, was instituted by Prof. Schultze (Ueber den Organismus der Polythalamien, &c., 1854) for "a minute Monothalamion of which he found several specimens at Ancona, adhering to the surface of Algae and to the sides of a glass vessel in which sea-water had been long kept. The shell, whose largest diameter is about 1-300th of an inch, has the form of an irregular plano-convex lens, being usually flat, or nearly so, on its attached side (which accommodates itself to the surface whereon it grows) and convex on its free side, on some part of which, usually about halfway between the centre and the periphery, is a wide orifice from which the pseudopodia issue. The shell is calcareous and opaque, and is destitute of pores; its adherent layer is very thin, and is with difficulty detached from the surface to which it is attached. The substance of the animal is of a brownish-yellow colour, as in Gromia; its pseudopodia, however, seem fewer and less disposed to subdivide and inosculate." (Carpenter, 'Introduction to the Study of the Foraminifera,' Ray Soc. Pub., p. 67, pl. 1. fig. 22; also Pritchard, 'Infusoria,' p. 558, ed. 1861.) Two arenaceous forms of this genus live in the laminarian zone at Budleigh-Salterton, as their presence on certain fuci cast upon the beach during storms indicates:—one like Squamulina lævis, the type species of Schultze's genus just described; the other, also discoidal, but bearing a little, erect, brush-like eminence on its convexity. For the former I would suggest the specific name varians, and for the latter scopula, from the resemblance of the eminence to a little brush or broom.